Pneumatic drill



C. JACKSON.

PNEUMATIC DRILL.

APPLICATloN FILED JUNE H. 1919.

1,376,545. Patented May 3, 1921.

$7 Ma-Awww@ @tramway UNITED STATES PATENT OFFICE.

PNEUMATIC DRILL.

Specification of Letters Patent.

Patented May 3, 1921.

Application led .Tune 11, 1919. Serial No. 303,352.

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Be it known that I, CoRWILL JACKSON, a citizen of the United States,residing at Kalamazoo, -Michigan, have invented certain new and usefulImprovements in Pneumatic Drills, of which the following is aspecification.

This invention relates to improvements in pneumatic drills.

The main objects of this invention are to provide an improved drillwhich is simple and economical in its parts, light in weight and compactand durable in structure.

Further objects, and objects relating to structural details, willdefinitely appear from the 'detailed description to follow.

I accomplish the objects of my invention by the devices and meansdescribed in the following specification. The invention is clearlydefined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearlyillustrated in the accompanying drawing, forming a part of thisspecification, in which:

Figure I is a side view of my improved drill.

Fig. II is a detail view mainly in verti` cal central section.

Fig. III is a detail horizontal section on a line corresponding to line3-3 of Figs. I and II.

Fig. IIIA is a detail vertical section on a line corresponding to line3A-3A of Fig. III, showing details of the rotor and its cylinder, andpassa es and ports thereof.`

Fig. vIV is an en arged detail side elevation showing outlet port, theinlet port being1 indicated by dotted lines.

ig. V is a detail section on a line corresponding to line 5-5 of Fig.II.

In the drawing, similar reference characters refer to similar partsthroughout the several views, and the sectional views are taken lookingin the direction of the little arrows at the ends of the section lines.

Referring to the drawing, I provide a frame or body comprising a topbody member l, having a handle or grip 2 at the top thereof. Onits'under side, the bod member l has a recess-like rotor cylinder 3formed therein. The inlet passage 4 has an annular delivery portion 5communicating with the cylinder through a plurality of ports.

The intermediate body member 7 constitutes a head or end member for thecylinder and is provided with a chamber-like gear box 8 openingdownwardly. The bottom member 9 closes this gear box. The top andintermediate members are secured together by bolts 10, and the bottommember is secured to the intermediate member by screws 11.

Within the rotor' chamber, or cylinder, lis a rotor 12 having upwardlyfacing pockets 13 disposed to receive the impact from the propellingfluid such as compressed air. The rotor shaft 14 is supported by abearing 15 on body member 1, and a bearing 16 alined therewith on theintermediate body member 7. The bottom member is provlded with a bearing17 for spindle 18. The spindle is provided for a chuck 19 to receive thedrill or tool. The spindle 18 is preferably in alinement with rotorshaft 14.

On the end of the spindle within the gear boX is a gear 20 which isconnected to a pinion 21 on the rotor shaft by means of the transmissiongears 22 and 23 on transmission shaft 24. The upper end of this shafthas a bearing at 25 in the intermediate body member, while its lower endhas a bearing 26 in the lower body member. This overlappping arrangementof the gears within the gear box permits a very compact arrangement. 4

The control valve 27 is arranged -1n a bore-like valve casing 28 formedin the upper body member. The valve is of the plunger type and has anannular groove 29 adapted to be brought into register with the passage4. The valve stem 30 is arranged through the body member 1 to project atthe top thereof, so that it may be manipulated by the thumb of theopeiator while grasping the handle 2. The coil spring 31 holds the valvenormally closed.A The eX- lljiaust 32 opens at the side of the body memMy improved drill is very compact and durable in structure andconvenient to manipulate. The parts are simple and economical to produceand easily assembled ory disassembled, as the occasion requires. Themoving parts are all effectively housed and protected.

I have illustrated and described m improvement in an embodiment whichfind very practical. I have not attempted to illustrate or describecertain modifications which I contemplate as I believe vthe d1 sclosuremade will enable those skilled m the art to which my invention/relatesto embody oi' adapt the same, as may be desired. f

Having thus described my invention, what I claim as new and desire tosecure by'Letters Patent is: y

1. The combination of a frame or body comprising a top body memberprovided with a handle and having a cylinder in its under side and inletand exhaust passages, said inlet passage being provided with an annulardelivery portion above the cylinder communicating with said cylinderthrough a plurality of ports, an intermediatebody member constituting a.gear box, a bottom member provided with a spindle bearing,

said top and intermediate members havingA alined rotor shaft bearingsalined with said spindle bearing and said intermediate and bottom bodymembers having alined transmission shaft bearings disposed at one sideof said rotor shaft and spindle bearings, a valve for said inlet passageprovided with a stem projecting above said handle, an upwardly facingfiuid impact rotor disposed in said cylinder, a shaft therefor disposedin said rotor shaft bearings and projecting into said gear box, aspindle disposed in said spindle shaft bearing, a transmission shaftdisposed in said transmission shaft bearings, and a train of spindledriving gears on said rotor and transmission shafts and spindle.

2. The combination of a frame or body comprising a top body memberprovided with a handle and having a cylinder in its under side and inletand exhaust passages, an intermediate body member constituting a gearbox, a bottom member provided with a spindle bearing, said top andintermediate members having alined rotor shaft bearings alined with saidspindle bearing and said intermediate and bottom body members havingalined transmission shaft bearings disposed at one side of said rotorshaft and spindle bearings, a. fluid impact rotor disposed in saidcylinder, a shaft therefor disosed in said rotor shaft bearings and pro-]ecting into said gear box, a spindle disposed in said spindle shaftbearing, a transmission shaft disposed in. said transmissionshaftbearings, and a train of' spindle driving gears on said rotor andtransmission shafts and s indle.

3. he combination of a frame or body comprising a top body s with ahandle and having -a cylinder 1nl its under side and inlet and exhaustpassages,

said inlet assagebeing provided with an annular de ivery portion abovethe cylinder communicatin with said cylinder through a plurality oports, an intermediate body member constituting a gear box, a bottommember, a valve for said inlet-passage provided with a stem projectingabove said member provided handle, an upwardly facing fluid impact rotordisposed in said cylinder, a rotor shaft projecting into said gear box,a spindle mounted on said bottom member, and a train r` said under sideand inlet and exhaust passages,

an intermediate body member constituting a gear box, a bottom member, avalve for said inlet passage provided with a stem projecting above saidhandle, a Huid impact rotor disposed in said cylinder, a rotor shaftprojecting into said gear box, a spindie mounted on said bottom member,and a train of spindle driving gears connecting said rotor shaft andspindle disposed in said gear box. v

5. The combination of a frame or body comprising a top body memberprovided with a handle and having a cylinder in its under side and inletand exhaust passages, said inlet assage being provided with an annularde ivery portion above the cylinder communicating with said cylinderthrough a plurality of ports, an intermediate bodyv member constitutinga gear box, a bottom member, an upwardly facing fluid impact rotordisposed in said cylinder, a rotor shaft projecting into said gear box,a spindle mounted on said bottom member, and a train' of spindle drivinggears connecting said lilotor shaft and spindle disposed in said gear 6.The combination of a frame or bdy provided with a handle and a cylinderand a gear box disposed one above the other, an1 inlet passage for saidcylinder provided with an annular delivery portion communicating withsaid cylinder through a plurality of ports, a valve for said inletpassage provided with a stem pro'ecting above said handle,

an upwardly facing fluid impact rotor disosed in said cylinder, a shafttherefor pro- ]ecting into said gear box, aspindle disposed in alinementwith said rotor shaft, a transmission shaft disposed at one side of saidrotor shaft. and spindle, and a train of spindle driving gears on saidrotor and transmission shafts and spindle.

7. The combination of a'frame or body provided with a handle and acylinder and a gear box disposed one above the other, an in saidcylinder, a shaft therefor projecting inlet passage for said cylinderprovided'with into said gear box, a spindle, and a train o an annulardelivery portion communicating spindle driving gears connecting saidrotor 10 with said cylinder through a plurality of shaft and spindledisposed in said gear box. ports, a valve for said inlet passageprovided In witness whereof I have hereunto set my with a stemprojecting above said handle, an hand and seal.

upwardly facing fluid impact rotor disposed v CORWILL JACKSON., [1.. 8.]

